Jack



JACK

Filed Aug. 4, 1950 V ard a1re oylindrically formed throughout the major extent thereof, as indioated at 88. One side of the standard top, however, projects outwardly to forma an overhanging lug 39, this 111g being provided 'preferably 011 the side of the jack above the driving pinion 25,

Just below the top of the standard. 'Just above the bearing surface the nut is in-v teriorly grooved as indicated at 4l the shap e of the groovebeinf; such thatit may receiVe th6lug 39 of thdstandard, as Shown. The

port1ons of the nut, created by rotation of lower portionof the groove 41 bears against speotto the standard. The nut, however,

the bottom of the 111g 39 and at this point it Will be understoocl tha't the 111113 is 'prevehted. from moving vertically upwardly with remay be readily ap'plied to the top of the "Stlldlld before t he lifting screw 16 is in threadecl engagement With the nut. 'If' it is assumed that the nut 16 is entirely removed, and the pinion 25 is also removed from the standard, it Will bei apparent that the nut may be tilted so as to raise the right-hand side of fche nut as viewed in Fig. 2, the n 11t pivoing about its interlocking engagement with the top of the standard at 111g 89, and the *n t may. then 'be moved laterally in its tilted position so as to disengage the interloking arts at the bottom of the the top of the standard.

The nufa 22 has a downwardly faoing bearnut and ing surface 43, and while this surface may Trost. direotly 011 the top of the st;andzirdto engage .the flat surface 37 jor0vided thereon, an antifrictiofl bearing isfpreferably interposod between those two st1rf21ces 43 ahd 37.

This boaring isshown at 44 and preferably 1 Comprise's'pper and'lower bearing races and a number of ball s or rollers therebetwe6tx. The antifriction bearing, 0f coi1rse, materiallyreduces the friction and provides for 'easy Operationbf thejack.

113 will noW be apparent that the varios parts of -tho j ack'may be very readily assembled. The nut 22 with the antifriction' bearing parts in place,is.first a]oplied to thetop in an inclined attitude to engage the standard lug with the grOove in the nut, and then tilting the nut down into a horizontal position on 'the -standard. The screw 16, with the 'pin-l8in place, iS then moved up fihrough fihe bottom of the standard andt-hreaded into the nut 22 by rotating the' latter. A top sadof the lifting screw and riVeted o1 otherwise ortion. into the bore of the standard 111g 28 pinion 25 and the SIBW 16 are assembled,it will be apparent that any tilting movements of tho nut 22 on the top of the standard Will be prevented, and unless the nut 22 can ti1t it cannot be removed. The interlocking parts of the nut on the standard being located -firmly 011 the top of the standard, and When ther e is no load onltho jackit will be ap'pz'altent that th6upWzird thi usts on the peripheral the driving pinion, are comparatively small so that th6yca'n readily be taken Gare of by the frictional engagement 0f the nut anid the standatdht oho point whefo they. a1{e interlockingly engaged.

It will be' appgz 1feint that thedissembly l of the ja ok parts may be' acc0mplishedfiery readily if thie saddle is applied in a remoV- ab1e manrier to the top ofthe lifting sorew.

Thus, the 1i fting screw may be thriaetded 'downvardly through' the lifting i1u't, :the

holding pi'n 84 2111d" the driving pinion removed;after which -the operating mit inaybe readily 1emoVed. froni t-he top of the standard without disturbirig athfy part of.the standa&rd fitself, which c2m therefore 106 'of integral rigid construotion, tho standard being pref erably mde 'as aiSingle 'piece oasting.

Whi1o the fo'rm'of apparatus herein described' cdnstifites aJ -I)referted mbodiment of the inv'ention5 if i's tobe ui1derstood tht the invention is not limifie'd to thi's preciso forma of apparatus, and that cha1'1ges may be" made therein Without departiing fr0m the scope of the inventio'nwhich is defind in the appended claims. What isclaimedils'z' 1. A lifti1ig jack Coin}'rising a lifting screW,' a standa'rd telesc0pically freceiving said scre'v'v, a nut -in threadedengagement with s'aid screw, the top o1 che 'stz'mdardbeing unsymmetricztlly formed so as to have a projectirig poriiio n thereo11, 'the mit having rovision: for interlockingly ng'ztging said ortion pr0vidingfifor rea'dyassembly o'f Ehe nut but holding the nut a'gainst axialjihovescrew, a, telesco'pioz'illy' receiVing said sofew, a; nut in threadgd Chgagenient with said screw, the.nut a'nd the end of the standard having interl o cking- PQI'1I\1S providing fotasse mbly of'the nut in aninclined" positio1i before the liftii1g screw is thread'ed in the nutpreVenti ng tilting movom eilts of tho nu t to frpai ntain the u nut ag' ainst aXial -35 and 13116 pin 34 is driven in p1ace. When the movements With r elatin to the standqrd;

f in said nut,the Iiflting screw when threaded applied by shpping the. cyl1ndrical bearing on1y at the top of the standard to be 3. A Iift-ing jack comprising a lifting screw, a standard telescopically receiving said screw, a nut in threaded engagement,

with said screw, the standard having a flat top surface, the nut extending down below the top of the standard and 'in bearing engagement With the standardbelow the 130 thereof, said nut having a groqve provide at a point be1ow the top of the standaxd, the standard having a 111g projecting at one side received in said groove.

In testimony Whereof I .hereto afiix my signature.

ALBERT H. LANGENHEIM. 

